Arduino Street Light

int button = 2; // switch is on pin 2
int buttonValue = 0; // switch defaults to 0 or LOW
int red = 13;
int yellow = 12;
int green = 11;

void setup(){
pinMode(red,OUTPUT);
pinMode(yellow,OUTPUT);
pinMode(green,OUTPUT);
pinMode(button,INPUT);
digitalWrite(green,HIGH);
}

void changeLights(){
// green off, yellow for 3 seconds
digitalWrite(green,LOW);
digitalWrite(yellow,HIGH );
delay(3000);

// turn off yellow, then turn red on for 5 seconds
digitalWrite(yellow,LOW);
digitalWrite(red,HIGH);
delay(5000);

// red and yellow on for 2 seconds (red is already on though)
digitalWrite(yellow,HIGH);
delay(2000);

// turn off red and yellow, then turn on green
digitalWrite(yellow,LOW);
digitalWrite(red,LOW);
digitalWrite(green,HIGH);
}

void loop(){
// read the value of the switch
buttonValue = digitalRead(button);
// if the switch is HIGH, ie. pushed down – change the lights!
if (buttonValue == HIGH){
changeLights();
delay(2000);
}